CET ECG Equipment Operation & Maintenance 1 — Questions and Answers

Question 1: What is the primary purpose of calibrating an ECG machine?

To clean the machine's internal components.
To update its software.
To check for electrical interference.
To ensure accurate output of waveforms (Correct answer)

Correct answer: To ensure accurate output of waveforms

Calibrating an ECG machine is a crucial maintenance step that involves adjusting its settings to a known standard. This process ensures that the machine accurately measures and displays the heart's electrical activity, producing waveforms that are correctly scaled and precisely interpretable. Proper calibration is essential for reliable diagnostic readings.

Question 2: Which component of the ECG machine amplifies the electrical signal from the heart?

Electrodes
Filter
Amplifier (Correct answer)
Display screen

Correct answer: Amplifier

The electrical signals generated by the heart are naturally very small and weak. The amplifier within the ECG machine is specifically designed to take these minute signals, picked up by the electrodes, and significantly increase their voltage. This amplification makes the signals strong enough to be processed, filtered, and displayed as clear, readable waveforms on the ECG output.

Question 3: How often should ECG electrodes be replaced?

Once a month
After each use (Correct answer)
Once a week
Only when they fall off

Correct answer: After each use

ECG electrodes are designed for single use to ensure optimal conductivity, adhesion, and hygiene. Reusing electrodes can lead to several issues, including dried conductive gel, contamination from skin oils, or reduced stickiness, all of which can result in poor signal quality, artifacts, and inaccurate ECG readings. Replacing them after each use guarantees the best possible contact and signal integrity.

Question 4: Which maintenance step helps prevent artifacts in ECG readings?

Changing the paper roll
Updating the software
Cleaning electrodes and checking connections (Correct answer)
Recharging the battery

Correct answer: Cleaning electrodes and checking connections

Artifacts, which are unwanted disturbances or noise in an ECG reading, often stem from poor electrode contact or loose lead connections. Regularly cleaning the patient's skin where electrodes are placed, ensuring fresh electrodes are used, and verifying that all lead connections are secure are vital steps. These actions minimize electrical interference and motion artifacts, leading to clearer, more accurate, and diagnostically reliable ECG tracings.

Question 5: Why is it important to store ECG machines properly?

To ensure it is visible to staff
To keep it away from patients
To avoid theft
To protect the machine from environmental damage (Correct answer)

Correct answer: To protect the machine from environmental damage

Proper storage of an ECG machine is essential to protect its sensitive electronic components from various environmental hazards. Keeping it in a clean, dry, and temperature-controlled environment shields it from dust, moisture, extreme temperatures, and potential physical damage. This care prolongs the machine's lifespan, maintains its accuracy, and ensures it functions reliably for patient care.

Question 6: What should be done before using an ECG machine?

Only wipe the screen
Check battery, leads, and calibration (Correct answer)
Replace electrodes only
Turn on the machine for 5 seconds

Correct answer: Check battery, leads, and calibration

Before using an ECG machine, a Certified Electrocardiogram Technician (CET) must perform a thorough pre-use check. This includes verifying the battery level to ensure uninterrupted operation, inspecting all leads for any signs of damage or wear, and confirming that the machine is properly calibrated. These steps are critical to guarantee accurate and reliable recordings of the patient's heart activity.

Question 7: Which action may lead to inaccurate ECG recordings?

Using fresh electrodes
Placing the machine near a cellphone (Correct answer)
Patient lying still
Turning off lights

Correct answer: Placing the machine near a cellphone

Electronic devices like cellphones emit electromagnetic interference (EMI) that can significantly disrupt the sensitive electrical signals an ECG machine is designed to record. Placing the machine too close to such devices can introduce artifacts or noise onto the ECG tracing. This interference makes it difficult to accurately interpret the heart's true electrical activity, potentially leading to misdiagnosis.

Question 8: Why should you inspect ECG cables regularly?

To ensure aesthetic appearance
To reduce machine weight
To prevent signal issues (Correct answer)
To increase screen brightness

Correct answer: To prevent signal issues

Regular inspection of ECG cables is crucial because damaged or worn cables can lead to poor electrical contact and signal interference. This can introduce artifacts or noise into the ECG tracing, making it difficult to accurately interpret the heart's electrical activity. Ensuring cable integrity prevents these signal issues, which is vital for obtaining reliable diagnostic information.

Question 9: What feature helps detect machine malfunction during ECG?

Battery light
Paper tray
Self-test indicators (Correct answer)
Color display

Correct answer: Self-test indicators

Self-test indicators are built-in diagnostic features in modern ECG machines that automatically check the device's functionality. These indicators alert the technician to any potential hardware or software malfunctions, ensuring the machine is operating correctly and producing accurate readings. Relying on a faulty machine could lead to incorrect diagnoses, making these indicators essential for quality control.

CET ECG Equipment Operation & Maintenance 1

What is the primary purpose of calibrating an ECG machine?